; RUN: llc -mtriple=aarch64-none-linux-gnu < %s | FileCheck %s define i32 @foo(i32* %var, i1 %cond) { ; CHECK: foo: br i1 %cond, label %atomic_ver, label %simple_ver simple_ver: %oldval = load i32* %var %newval = add nsw i32 %oldval, -1 store i32 %newval, i32* %var br label %somewhere atomic_ver: %val = atomicrmw add i32* %var, i32 -1 seq_cst br label %somewhere ; CHECK: dmb ; CHECK: ldxr ; CHECK: dmb ; The key point here is that the second dmb isn't immediately followed by the ; simple_ver basic block, which LLVM attempted to do when DMB had been marked ; with isBarrier. For now, look for something that looks like "somewhere". ; CHECK-NEXT: mov somewhere: %combined = phi i32 [ %val, %atomic_ver ], [ %newval, %simple_ver] ret i32 %combined }